LAN to WAN组网下双路由器WiFi中断故障排查及配置调整求助

Hey there, let's break down the issues and fix your intermittent WiFi problems step by step. Based on the configs you shared, here are the key adjustments you need to make:

• Fix the DHCP range typo on your secondary TP-Link router
  You mentioned the LAN DHCP range is 192.168.0.100 to 192.168.199—that's a critical mistake! The second part should be 192.168.0.199 to match your secondary router's LAN subnet (192.168.0.x). A mismatched range will cause devices connected to the secondary router to fail getting valid IP addresses, which directly leads to random disconnections.

• Resolve WiFi channel interference
  Your primary router uses auto-channel selection, while the secondary is fixed to channel 3. There's a high chance the primary might switch to a channel that overlaps with channel 3 (especially on 2.4GHz, where channels 1-4 overlap heavily), causing signal interference and dropouts.
  First, log into your primary router to check which channel it's currently using. Then set your secondary router's WiFi channel to a non-overlapping one—for 2.4GHz, channels 1, 6, and 11 are the safest non-overlapping options. Alternatively, you can set the secondary router to auto-channel too, but manual selection is more stable if you know the least crowded channel in your area.

• Stabilize the WAN connection of the secondary router
  Your secondary router gets a dynamic IP (192.168.1.2) from the primary's DHCP pool. To avoid the primary router reassigning this IP later (which would break the secondary router's internet access), log into your primary router and set up a static IP reservation for the secondary router's WAN port MAC address. Assign it the fixed IP 192.168.1.2 so it never changes.

• Optimize WiFi roaming (optional but recommended)
  If you want seamless switching between the two routers' WiFi networks, set both to use the same SSID (WiFi name) and password. This lets your devices automatically connect to the strongest signal without manual switching. Some TP-Link routers also support fast roaming features (like 802.11r), so check if your model has that and enable it if available.

After making these changes, reboot both routers and test your WiFi for a few hours—this should eliminate the intermittent interruptions.

备注：内容来源于stack exchange，提问作者user1053173